We introduce an approach toward predicting intranational variance in individualism-collectivism, via utilization of ecological cultural practices and psychological cultural values. Using the climato-economic theory of culture, we modeled intranational collectivism using four measures, including normative behavioral and spatial collectivism practices, and the mean and dispersion of collectivism values, in one country, Turkey. Results evidenced confluence of findings based on both ecological measures and dispersion-based collectivism values. Conversely, mean collectivism values fared poorly. Study predictors explained up to approximate to 87% of the variance in intranational collectivism. Richer provinces with harsher climates were less collectivistic; vice-versa for poorer provinces with harsher climates.